PS2 is not retro. You look at something like Soul Calibur 3, Pro Evolution 2009 or Smackdown 2009 and tell me its retro.
Retro is something that would be far less technical than current releases. I wouldn't be surprised if there was some kind of new Tetris released in 2008, yet regardless of its release date, its still retro. Yesterday's formula.
PS2 is not retro, yet it has retro games. Check that shelf again in Gamestation. It could be full of games like Konami Collection and that sort of thing.
Retro = 15+ years old